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(No Model.) 7 2 Sheets-Sheet 1 .G. TRIPPEN & F. TRIPPEN, Jr.

SECONDARY ELECTRIC CLOCK. No. 309,809. Patented Dec. 23, 1884.

N. PETERS, Pbmm-Liuw m mr. Washmglou. D. c.

UNITED STATES PATENT OEEIcE.

GEORGE TRIPPEN AND FREDERICK TBIPPEN, JR, OF PHILADELPHIA, PA.

SECONDARY ELECTRIC CLOCK.

SPECIFICATION forming part of Letters Patent No. 309,809, dated December 23, 1884.

Application filed August 11, 1884.

To all whom, it may concern.-

Be it known that we, GEORGE TRIrrEN and FREDERIcK TRIPPEN, J12, both citizens of the United States, and residents of Philadelphia, Pennsylvania, have invented certain Improvements in Electrical Clocks, of which the following is a specification.

Our invention consists of an improved con struction of electrical clock, whereby a number of clocks in acircuit maybe operated synchronously from one clock at a central station, as more fully described hereinafter.

In the accompanying drawings, Figure 1 is a perspectiveview of the electrically-operated portion of the clock or time mechanism, but with the train of gears omitted, as they may be of any usual form. Fig. 2 is a view, partly in diagram, of the circuit-changer,which is to be applied to and operated by the motonclock at the central station. Fig. 3 is a vertical section of the mechanism, Fig. 1, on the line 1 2, Fig. 5. Fig. 4c is a section on the line 3 Fig. 5, looking in the opposite direction. Fig. 5 is a plan view of the device; and Fig. 6 is a perspective view of the contacts of the circuit-changer, Fig. 2.

Referring to Figs. 1, 3, a, and 5,whichillus- Irate the operative mechanism of each clock in the electrical circuit, A is the main axis, mounted in bearings in standards a and a, and A is the first wheel of a train of gears of any usual form for imparting the requisite movements to the second, minute, and hour hands of the clock.

On the axis A are mounted two wheels, BB, having inclined teeth of the form illustrated in Fig. 3, the incline on one side of each tooth being longer than that on the other.

In bearings in standards (I d, at right angles to the main axis, is mounted a rock-shaft, D, carrying a lever, E, with beveled ends 0, to engage with the teeth of the wheels B and B alternately. The bevel at each end of the lever is on one side onlynamely, that which would come into contact with the long incline of each tooth of the wheel B B so that as the rock-shaft D is vibrated the bevel 6 will come into contact with a tooth of the wheel, as indicated in Fig. 3, and as it continues to descend to the bottom of the notch between the teeth will give a partial movement to the wheel B,

(No model.)

and when the rock-shaftDis moved in the opposite direction the opposite beveled end of the lever E will give a like movement to the wheel B. tary movement is imparted to the axis A,and thence to the train of gears controlling the hands of the clock.

The rocking lever E carries two armatures, m m, which are acted on by the two pairs of electro-magnets, M M. mounted on an insulating-piece, n, on the base N. The armatures m m are preferably mounted on the lever E, near the shaft D, and the polar extensions of the electro-magnets are bent inward correspondingly, to act on the said armatures.

On the axis A is mounted a ratchet-wheel, F, Fig. 4, into which takes a spring-pawl, f, carried by an adjustable arm, f, passing through a slot in the standard (I, and adapted to be secured by a suitable set-screw. This adjustable spring-pawl and ratchet-wheel simply serve to prevent back movement of the main axis, the intermittent forward movement being produced entirely by the rocking lever E and wheels B B.

By magnetizing the electro-magnets M M alternately the consequent alternate attraction of the armatures m and m will produce the rocking movement of the lever to give the desired rotary motion to the axis A and thence to the hands of the clock.

Different constructions of circuit-changers may be employed at the central station to cause the alternate magnetization of the electro-magnets M and M; but we prefer that shown in Figs. 2 and 6.

An insulating-bracket, G, carries a bindingpost, 9, connected'by a conductor, 1,with one pole of the battery L, whose other pole is connected by a conductor, 1, to one terminal of each of the electromagnets M and Ill. The other terminal, 2, of the electro-n1agnct M is connected to a binding-post, g, in electrical connection with arod, I-I, carrying at its lower end an adjustable platinum tip, h. The second terminal of the other elect-ro-magnet, M, is con nected by a conductor, 3, to abindingpost, g, in electrical connection with a rod, II, also carrying an adjustable platinum tip, it.

Between the two platinum points is mounted avibrating insulating-frame, J, mounted on a In this manner an intermittent ropivot, j, which maybe the pivot of the pen-- I dulum P of the motor-clock; or it may have i an oscillating movement imparted to it from I any convenient moving part of the clock. I This frame 3 carries two ilat springarms, lrl K, having at their lower ends platinum points i Z: k, and as the frame J oscillates the point 7. will iirst come into contact with the point 71, and then thcpoint 7.1 will come into contact: with the point 71 and so on alternately. The two s1 ring-plates K and li are connected through a metal plate, '6, and conduetori with thebindl ing post g, and in this way the circuits through the two electromagnets )I and ill are made and broken alternately.

ltwill be observed that the platinum points l 7t: 7t" and ii 71 are in the form of pointed pins, and make contact with each other along their sides, as indicated in Fig. 6, so that the scrap ing contaetwill aways keep them bright, and the movement will be more regular than it" a stop-contact were used.

o claim as our invention 1. The combination of the train-gear of a time mechanism, and the main axis carrying two wheels having inclined teetlnwith a rocking lever with beveled ends adapted to act alternately on said wheels,and electrical devices, substantially as described, for imparting a rocking motion to said lever.

2. The combination of the train-gear of a time mechanism, and the main axis carrying two wheels having inclined teetlnwitharocking lever with beveled ends to act on said wheels alternately, armatures mounted on said lever, and electro-magnets to act on said armatnres, all substantially as set forth.

3. The combination of the train-gear ot' a time mechanism, and the main axis carrying two toothed wheels, and a rocking-lever having beveled ends to act on said wheels, with armatures carried by said lever, electro-magnets, and a circuit-changer to throw the said electromagnets into action alternately, substantially as specified.

1-. The combination of a pin-shaped platinum contact-point, 7z,with an oscillating frame carrying a llat spring, K, with a platinum point adapted to make side contact with the point 71, and the pendulum of a motor time mechanism controlling said frame, substantially as set torth.

in testimony whet-cot we have signed our names to this specification in the presence of two subscribing witnesses.

GEO. TDIIPEN. Fltlllllill 110K T] llPEN, Ji Witnesses:

.l'oitX M. CLAYTON, HARRY Snr'ru. 

